In this issue:
- Geometry and origin of deformational structures in the Precambrian metamorphic rocks of the Hill City area, Black Hills, South Dakota
- Silurian continental margin in northern Nevada and northwestern Utah
- Vertebrate fauna of the Laramie Formation (Maestrichtian), Weld County, Colorado
- K-Ar age for the Fowkes Formation (middle Eocene) of southwestern Wyoming
- Description of a large trionychid turtle shell from the Eocene Bridger Formation of Wyoming
- Angiosperms from the late Tertiary Keller local fauna of Ellis County, Kansas
- Aspects of continental crustal structure and growth; targets for scientific deep drilling
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